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Crossing changes. (English) Zbl 0937.57004
Summary: This is an expository survey article about the role that the simple operation of changing a crossing has played in knot theory. Topics include: the connections between unknotting number, tunnel number, and crossing number; connections with Dehn surgery and sutured manifold theory; nullifying crossings and the Conway skein trees; generalized crossing changes; crossing changes and strongly invertible knots; and connections with 4-manifold topology.

##### MSC:
 57M25 Knots and links in the $$3$$-sphere (MSC2010)
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##### References:
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